To Measure Satisfaction with Its Cell Phone Service, AT&T Takes

Multiple Choice

To measure satisfaction with its cell phone service, AT&T takes a stratified sample of its customers by age, gender, and location. Which is an advantage of this type of sampling, as opposed to other sampling methods?

A) It is less intrusive on customers' privacy.
B) It does not require random numbers.
C) It gives faster results.
D) It can give more accurate results.